Related Party Transactions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues - related parties:
Total revenue - related parties	$ 45.0	$ 56.7	$ 72.3
Costs and expenses - related parties:
Operating costs and expenses	1,112.8	1,104.0	1,080.5
General and administrative expenses	121.5	113.1	114.1
Total costs and expenses - related parties	1,234.3	1,217.1	$ 1,194.6
Accounts receivable - related parties:
Total accounts receivable - related parties	1.8	1.1
Accounts payable - related parties:
Total accounts payable - related parties	$ 127.3	$ 105.1
At-the-Market Registration [Member]
Relationship with Affiliates [Abstract]
Number of common units issued (in units)	21,807,726	87,867,037	25,520,424
Gross proceeds from the sale of common units	$ 603.1	$ 2,170.0	$ 825.4
Distribution Reinvestment Plan [Member]
Relationship with Affiliates [Abstract]
Number of common units issued (in units)	18,541,355	15,809,503	12,413,351
EPCO and its privately held affiliates [Member]
Costs and expenses - related parties:
Total costs and expenses - related parties	$ 1,010.9	$ 963.2	$ 949.3
Accounts payable - related parties:
Total accounts payable - related parties	99.3	88.9
Distributions:
Total cash distributions	$ 1,120.0	$ 1,070.0	$ 948.3
Number of Designated Units excluded from distributions (in units)			35,380,000
Relationship with Affiliates [Abstract]
Number of Units (in units)	689,767,023
Percentage of Total Units Outstanding	32.00%
Enterprise common units pledged as security (in units)	81,346,154
EPCO and its privately held affiliates [Member] | At-the-Market Registration [Member]
Relationship with Affiliates [Abstract]
Number of common units issued (in units)		3,830,256	3,225,057
Gross proceeds from the sale of common units		$ 100.0	$ 100.0
EPCO and its privately held affiliates [Member] | Distribution Reinvestment Plan [Member]
Relationship with Affiliates [Abstract]
Number of common units issued (in units)	4,246,498
Gross proceeds from the sale of common units	$ 100.0	100.0	100.0
EPCO and its privately held affiliates [Member] | Administrative Services Agreement [Member]
Costs and expenses - related parties:
Operating costs and expenses	882.1	840.7	826.4
General and administrative expenses	110.4	105.3	105.2
Total costs and expenses - related parties	992.5	946.0	931.6
Unconsolidated affiliates [Member]
Revenues - related parties:
Total revenue - related parties	45.0	56.7	72.3
Costs and expenses - related parties:
Total costs and expenses - related parties	223.4	253.9	245.3
Accounts receivable - related parties:
Total accounts receivable - related parties	1.8	1.1
Accounts payable - related parties:
Total accounts payable - related parties	28.0	16.2
Unconsolidated affiliates [Member] | Seaway Crude Pipeline Company [Member]
Revenues - related parties:
Total revenue - related parties	19.6	36.3	47.7
Costs and expenses - related parties:
Total costs and expenses - related parties	98.8	161.2	175.8
Unconsolidated affiliates [Member] | K/D/S Promix, L.L.C. [Member]
Revenues - related parties:
Total revenue - related parties	7.8	7.0	8.8
Costs and expenses - related parties:
Total costs and expenses - related parties	27.8	27.1	24.9
Unconsolidated affiliates [Member] | Texas Express Pipeline LLC [Member]
Costs and expenses - related parties:
Total costs and expenses - related parties	29.5	22.8	6.7
Unconsolidated affiliates [Member] | Eagle Ford Pipeline LLC [Member]
Costs and expenses - related parties:
Total costs and expenses - related parties	42.8	36.2	39.4
Unconsolidated affiliates [Member] | Management/Operator Fees [Member]
Costs and expenses - related parties:
Total costs and expenses - related parties	$ (10.6)	$ (10.7)	$ (19.1)